Well, there are some people in Europe who don't really like the idea of people being able to choose what gender they want to be. They think that there should only be two genders: boys and girls, and that you can't change from one to the other.
These people are running what's called an "anti-gender" campaign. That means they're trying to stop people from expressing themselves the way they want to when it comes to gender.
They do things like making posters saying that boys have to like certain things and girls have to like other things, and that if you don't fit into those categories, something's wrong with you. They also try to stop schools from teaching kids about gender, because they think that it's something everyone should just know automatically.
But, a lot of people disagree with these ideas. They think that everyone should be able to express themselves however they want, and that it's okay if someone feels more like a boy or more like a girl, or somewhere in between. It's really important that people are allowed to be who they are, whether they're boys, girls, or something else entirely.